Thread: Mit-a-mit

The Hole is centred to the round. The plan is to bolt the dove tail to the underside of the ram. Then have two filler strips up the side..

The slotted bracket should be let in to the round part of the ram preferably.

The dia of the round bar I have is ~60mm. the original cast ram was 56mm Dia, so I'm calling that close enough. The max Dia of the head is 88.5mm so a collar will be added on or a plate to the front and the round shortened to suit.


So I block terms it should be like the drawing.







*** Edit just looking at that I thin that is n old revision. The Slotted part should be further to the side and not against the centreline. Also the hole might not actually be centred but 5mm up off centre. However if the only way to put the hole in is centred then the other dimensions can be made to take up the difference. All depends on what I can get facility to do and how much I try to make it look like the original. Priority 1 is a working machine.

MitaMit B133 36.jpgMitaMit B133 37.jpgMitaMit B133 40.jpgMitaMit B133 41.jpgMitaMit B133 42.jpgMitaMit B133 43.jpgMitaMit B133 45.jpgMitaMit B133 46.jpg

Things just got a bit more complicated.

Nah - of the collection of bits there the trickiest part to make is the 3 ball handle. A gear with an eccentric like that is not difficult - it just requires a 'little bit' of offset in a 4 jaw chuck. I could make you one easily if I had the dimensions (my calculations on the gear and tooth form still have me wondering where the error is).

Michael

I appreciate the offer Michael. The ball handle by the way on these is cast, and not as nice as other machines turned ones.

I should be getting some more dimensions from the owner of the MIT in the photos, who has been a great help by supplying photos and dimensions of his a section at a time. Without his help I'd still be guessing at a lot of it.

Originally Posted by DSEL74

Things just got a bit more complicated.

Then you didnt understand my ummmm "sketch". (hey I know what I was trying to get across lol)

Originally Posted by Michael G

(my calculations on the gear and tooth form still have me wondering where the error is).

Let me start by say I have almost no idea when it comes to gears. Though I do hate it when my limited maths doesnt work out the way it should, so I've been back through the thread and your notes and think I've found your problem(assuming I'm reading your notes correctly).

Originally Posted by DSEL74

I measured the small gear and the Dia of the shaft is 13.5mm, the gear is 10 teeth with a tooth to tooth diagonal measurement of 12mm, and 10mm at the base of the teeth.
The shaft which the ratchet works on is 15.5mm Dia. and edge to edge from the gear is 20.25mm, it is close enough to being on the same centreline.
The fixed stub is 12.75mm and there is 34mm edge to edge below the gear….I forgot to measure the offset or if it is directly below.

There is no way the 10 tooth gear is 12mm in Dia*. Not if the "fixed stub" is 12.75mm
https://www.woodworkforums.com/showth...93#post1886093
More in the 25mm range I'd guess

Now I'd like to be able to feed that into your maths and come up with an answer..... but I can't

Stuart

*which is the figure you're using right?

Screen shot 2015-08-17 at 10.57.46 AM.pngStill missing the O/A Dia. but a bit more info.

Originally Posted by Stustoys

There is no way the 10 tooth gear is 12mm in Dia*. Not if the "fixed stub" is 12.75mm
https://www.woodworkforums.com/showth...93#post1886093

*which is the figure you're using right?

Yes. But the photo has some optical distortion in it. I went back and scaled off the photo and came up with a maximum gear size of 22mm.

I tried a few different numbers but eventually I threw it all into a spreadsheet to get a most likely number out.
I fixed the size for the stud diameter at 12.75, and put the gears as 60t and 10t. Everything else could float.

The final results were small gear diameter = 16.94mm
'Edge to edge' distance = 34.55mm
Diametric pitch is 18 - that means the 60t gear should have an OD of 87.48mm

So Stuart's super power saves the world again. The nice thing is that now knowing the number of teeth and the DP those numbers can be slightly off as DP & n define the size of the gear.

Michael

Thanks for the maths. Glad its working out now.

That sure was a bad picture I picked!

This one works out better
https://www.woodworkforums.com/attach...9&d=1439736608
33/12.75=2.588
47/2.588= 18.16 thats closer to your number than 25

Stuart

I have most of parts of the same shaper under my workbench but haven't yet (in 3 years) begun chasing the same rainbow. Good on you!

If you would like to borrow the ram, or if I can assist with lend of other parts (don't have the table) I'm happy to do so. I live near Adelaide so shipping bits over to Melbourne shouldn't be too hard.

I'll drag it out tomorrow to see whether clapper box is there etc. and I'll read the thread properly to see what else I have that might help.

Regards, Roger

Thanks Roger. Please Post up some photos of yours.

I assume yours is incomplete also, other than the table what are you missing? Mine has the original table. There maybe an opportunity to make extra parts if you require one also.


Started working on the drawings for the ratchet.


I found a small tool post I maybe able to use rather than make it, even though it is one of he easier parts to make

Just now when I went back to the shed damn Canon wouldn't fire! Nothing much to look at since partially disassembled to fit under the workbench. I can take some detail photos after work tomorrow though.

If you'd like to borrow the ram, let me know earliest please as I'll have to make a small box to ship it in. The tool slide is still on it and the clapper, but no tool post.

Mine looks like it as been quite kicked around as the ratchet bracket is bent, all shafts seized, and the table gone. I'm not sure about the motor and belts, since I haven't looked at them for a while. Missing guards, but generally appears to be nothing irretrievably damaged.

If you'd like the ram to use it for a modeling session for a month or two, let me know by PM and I'll finally get rid of a pile of E-bay bubble wrap.

Regards, Roger

Got a parcel at the post office (postie won't deliver to house due to the puppy), had me curious all day as I wasn't expecting anything. Was wondering if I had made an eBay purchase I'd forgotten about.

Well this is what a nice person sent me as a surprise ...do they wish to be named??


I'll need to adjust the bores to fit but they look promising!! I'm stoked!!

Elves do exist, nice work who ever did the job. I hope that something good comes back to you.
Kryn

The small one is currently a press fit, so I will try to find and adjustable reamer and just give it a lick. The large one needs to be 12.7 (½" actually) so I need to figure out which is the true ½" the hole or the shaft and which has the tolerance. The I will enlarge the hole to 1/32 undersize and ream it out also. I'm assuming I will have adjustable reamer of the correct size and useable. I found about 5 of them in the hard rubbish once and never used one to date. I believe you set them to size with a micrometer, and only turn them clockwise and continuously to cut, reversing them blunts them badly. Pecking as you do with a drill to clear the flutes risks jamming the reamer. Although these are hand reamers I'm pretty sure.

I have some ver important things I need to be doing last night and today, yet all I can think about is getting these gears on the machine.